homeostasis:
what is homeostasis? (p. 16)
what is negative feedback? list 3 examples from your notes: (p. 16)
what is positive feedback? list 3 examples from your notes: (p. 16)

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Accepted Answer

### 1. What is Homeostasis?
# Brief Explanations:
Homeostasis is the ability of an organism or a cell to maintain a stable internal environment despite changes in the external environment. It involves regulating factors like temperature, pH, and nutrient levels to ensure optimal conditions for biological processes.
# Answer:
Homeostasis is the maintenance of a stable internal environment in an organism (or cell) despite external changes, regulating factors like temperature, pH, and nutrient levels for optimal biological function.

### 2. What is negative feedback? List 3 Examples from your notes:
# Brief Explanations:
Negative feedback is a regulatory mechanism where the output of a process inhibits or reduces the initial stimulus, helping to maintain homeostasis.
- **Example 1 (Body Temperature):** When body temperature rises, sweat glands produce sweat (cooling the body), and blood vessels dilate (increasing heat loss), which reduces the initial rise in temperature.
- **Example 2 (Blood Glucose):** After eating, blood glucose levels rise. The pancreas releases insulin, which causes cells to take up glucose (lowering blood glucose back to normal), reducing the initial glucose increase.
- **Example 3 (Blood Pressure):** If blood pressure rises, baroreceptors in blood vessels detect it. The brain sends signals to the heart (to slow down) and blood vessels (to dilate), decreasing blood pressure back to a set point, countering the initial rise.
# Answer:
Negative feedback is a regulatory mechanism where a process’s output inhibits its initial stimulus (maintaining homeostasis).
Examples:
1. Body temperature regulation (sweating/dilation to cool after a temperature rise).
2. Blood glucose regulation (insulin lowers glucose after a meal - induced rise).
3. Blood pressure regulation (heart slows/vessels dilate to lower elevated blood pressure).

### 3. What is positive feedback? List 3 Examples from your notes:
# Brief Explanations:
Positive feedback is a regulatory mechanism where the output of a process amplifies the initial stimulus (moving the system further from its original state, often for rapid change or completion of a process).
- **Example 1 (Blood Clotting):** A damaged blood vessel releases chemicals that attract platelets. Platelets release more chemicals, attracting more platelets, accelerating clot formation until the wound is sealed.
- **Example 2 (Childbirth):** Uterine contractions push the baby against the cervix, stimulating the release of oxytocin. Oxytocin increases contractions, further stimulating oxytocin release, until the baby is born.
- **Example 3 (Ripening of Fruit):** A ripe fruit releases ethylene gas, which causes nearby fruits to ripen. Ripened fruits release more ethylene, accelerating the ripening of the entire batch.
# Answer:
Positive feedback is a regulatory mechanism where a process’s output amplifies its initial stimulus (driving rapid change or process completion).
Examples:
1. Blood clotting (platelets release chemicals to attract more platelets, accelerating clotting).
2. Childbirth (uterine contractions stimulate oxytocin release, which increases contractions).
3. Fruit ripening (ripe fruits release ethylene, accelerating ripening of nearby fruits).

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Explanation:

1. What is Homeostasis?

Answer:

2. What is negative feedback? List 3 Examples from your notes: